Preheat oven to 350°F. Grease and flour an 8-inch round cake pan. Stir Insta-bake and sugar together. Add water egg and vanilla; beat 3 minutes at medium speed. Pour batter into prepared pan. Bake for 20 minutes or until toothpick inserted in center comes out clean. Cool. Sprinkle with powdered sugar or drizzle with your favorite glaze or frosting.
Chocolate: Add 1/3 cup cocoa and increase sugar to 3/4 cup.
Applesauce: In place of water and vanilla in basic cake recipe, use 1 cup applesauce, 1/4 tsp nutmeg, 1/8 tsp. cloves, 1 tsp. cinnamon. Increase sugar to 2/3 cup.